Sleep-Join方法理解

package cn.mayday.test;

public class JoinTest {

    public static void main(String[] args) {

        try {

            int count = 50;
            // while (count > 1) {

            Thread thread1 = new Thread(
                    new Runnable() {
                        public void run() {

                            try {
                                System.out.println("+++++ 1111 start ++++");
                                Thread.sleep(10000);
                                System.out.println("+++++ 1111 end ++++");
                            } catch (Exception e) {
                                System.out.println("Exception 1111 = " + e);
                            }
                        }
                    }
            );
            thread1.start();


            Thread thread2 = new Thread(
                    new Runnable() {
                        public void run() {
                            try {
                                System.out.println("+++++ 2222 start ++++");
                                Thread.sleep(10000);
                                System.out.println("+++++ 2222 end ++++");

                            } catch (Exception e) {
                                System.out.println("Exception 2222 = " + e);
                            }
                        }
                    }
            );
            thread2.start();

            thread1.join();
            System.out.println("++++++++++++ thread1111 join end ++++++++++++");

            thread2.join();
            System.out.println("++++++++++++ thread2222 join end ++++++++++++");


            Thread.sleep(1000);
            // }

        } catch (Exception e) {
            System.out.println("Exception = " + e);
        }

    }
}

 【总结】：从结果可以看出，主线程在线程1和线程2 join本身不阻塞，当时需要main线程做得动作全部阻塞

摘自